Of polymers of styrene

39.21 Other plates, sheets, film,foil and strip, of plastics. - Cellular : 392 1.11 - - Of polymers of styrene 392 1.12 - - Of polymers of vinyl chloride 392 1.13 - - Of polyurethanes 392 1.14 - - Of regenerated cellulose 3921.19 - - Of other plastics 3921.90 - Other This headin covers plates, sheets, film, foil and strip, of plastics, other than those of heading 39. 8, 39.19 or 39.20 or of Chapter 54. It therefore covers only cellular products or those which have been reinforced, laminated, su ported or similarly combined with other materials. (For the classification of plates, etc. corn ined with other materials, see the General Explanatory Note.) f ! According to Note 10 to this Cha ter, the expression"plates, sheets, film, foil and strip " ap lies only to plates, sheets, foil and strip and to blocks shape, w ether or not printed or otherwise surface-worked (for coloured, mere1 curved or corrugated), uncut or cut into rectangles M e r worked &en if when so cut they become articles ready for use). E $4 Plates, sheets, etc., whether or not surface-worked (includin squares and other rectangles cut therekom), with ground edges, drilled, milled, hemmed, twisted, fiame or otherwise worked or cut into shapes other than rectangular (including square) are generally classified as articles of headings 39.18, 39.19 or 39.22 to 39.26. cf